fixing 4 bugs, one for simple mode buttons. three for removing courses menu
Merge pull request #67 from LilongHuang/lilongBranch

fixing 4 bugs, one for simple mode buttons. three for removing courses menu
Merge branch 'master' of https://github.com/spockNinja/GhostGrader into intsToDoubles

Conflicts:
	src/interfaces/MainFrame.java